diff --git a/sqlite3.go b/sqlite3.go
index d8c5b8d..e48594f 100644
--- a/sqlite3.go
+++ b/sqlite3.go
@@ -648,6 +648,8 @@ func (c *SQLiteConn) RegisterAggregator(name string, impl interface{}, pure bool
 
 // AutoCommit return which currently auto commit or not.
 func (c *SQLiteConn) AutoCommit() bool {
+	c.mu.Lock()
+	defer c.mu.Unlock()
 	return int(C.sqlite3_get_autocommit(c.db)) != 0
 }